<!DOCTYPE html>
<!--
Copyright (c) 2015 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<link rel="import" href="/tracing/base/base.html">

<script>
'use strict';

tr.exportTo('tr.ui.tracks', function() {
  /**
   * EventToTrackMap provides a mapping mechanism between events and the
   * tracks those events belong on.
   * @constructor
   */
  function EventToTrackMap() {}

  EventToTrackMap.prototype = {
    addEvent(event, track) {
      if (!track) {
        throw new Error('Must provide a track.');
      }
      this[event.guid] = track;
    }
  };

  return {
    EventToTrackMap,
  };
});
</script>
